The German branch of the Jehovah's Witnesses called it a "horrific" attack while German Chancellor Olaf Scholz said it was a "brutal" and sent his condolences.
Their biggest announcement was a deal on illegal migration and border security but it is clear the two leaders want to put the post-Brexit animosity behind them.
Hundreds of thousands across France are set to ramp up protests against President Emmanuel Macron's pension bill, which raises the retirement age from 62 to 64.
Emmanuel Macron is staking his reputation and legacy on a raising the retirement age, but the plan — and the way he pushed it through — remains deeply unpopular.